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Extracting K-Ar ages from shales: the analytical evidence

Published online by Cambridge University Press:  09 July 2018

N. Clauer  and
S. Chaudhuri
N. Clauer*
Affiliation:
Centre de Géochimie de la Surface (CNRS-ULP), Ecole et Observatoire des Sciences de la Terre, 67084-Strasbourg France
S. Chaudhuri
Affiliation:
Department of Geology, Kansas State University, Manhattan, KS 66056, USA
*
*E-mail: [email protected]
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Abstract

The relationship between the K-Ar dates of mixed natural clays and the ratios of detrital and diagenetic components follows in most cases a linear trend, which agrees with the theory when the K2O contents of the end-members are similar. However, significant deviations from a linear trend may occur and take the form of poorly-defined concave curves. The absence of a linear trend is less likely to be due to the imprecise determination of the ratio between the two end-members than to heterogeneities of the natural samples which may arise from complex K-Ar evolutions of the detrital and diagenetic end-members. The straight-line approach is of limited use in the definition of diagenetic ages in shales by extrapolating linear trends to diagenetic end-members.

Keywords

K-Ar datingillitizationshales
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 2 , June 2001 , pp. 227 - 235
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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References

Clauer, N., Cocker, J.D. & Chaudhuri, S. (1992) Isotopic dating of diagenetic illites in reservoir sandstones: Influence of the investigator effect. Pp. 5–12 in. Origin, Diagenesis, and Petrophysics of Clay Minerals in Sandstones. SEPM Spec. Publ. 47.Google Scholar
Clauer, N. & Chaudhuri, S. (1995) Clays in Crustal Environments. Isotope Dating and Tracing. Springer Verlag, Heidelberg, Germany.Google Scholar
Clauer, N., Środoń, J., Francu, J. & Šucha, V. (1997) K-Ar dating of illite fundamental particles separated from illite/smectite. Clay Miner. 32, 181–196.CrossRefGoogle Scholar
Clauer, N., Rinckenbach, T., Weber, F., Sommer, F., Chaudhuri, S. & O’Neil, J.R. (1999) Diagenetic evolution of clay minerals in oil-bearing Neogene sandstones and associated shales from Mahakam Delta Basin (Kalimantan, Indonesia). Am. Assoc. Petrol. Geol. Bull. 83, 62–87.Google Scholar
Ehrenberg, S.N. & Nadeau, P.H. (1989) Formation of diagenetic illite in sandstones of the Garn Formation, Haltenbanken area, Mid-Norwegian continental shelf. Clay Miner. 24, 233–253.Google Scholar
Furlan, S. (1994) Transferts de matière au cours d’une diagenèse d’enfouissement dans le bassin du delta de la Mahakam (Indonésie). Un nouveau concept pour le mécanisme de l’illitisation. PhD thesis, Univ. Strasbourg, France.Google Scholar
Gorokhov, I.M., Clauer, N., Turchenko, T.L., Melnikov, N.N., Kutyavin, E.P., Pirrus, E. & Balashov, A.V. (1994) Rb-Sr systematics of Vendian-Cambrian claystones from the east European Platform: implications for a multi-stage illite evolution. Chem. Geol. 112, 71–89.Google Scholar
Hamilton, P.J., Kelley, S. & Fallick, A.E. (1989) K-Ar dating of illite in hydrocarbon reservoirs. Clays Clay Miner. 24, 215–231.Google Scholar
Hunziker, J.C., Frey, M., Clauer, N., Dallmeyer, R.D., Friedrichsen, H., Flehmig, W., Hochstrasser, K., Roggwiller, P. & Schwander, H. (1986) The evolution of illite to muscovite: mineralogical and isotopic data from the Glarus Alps, Switzerland. Contrib. Mineral. Petrol. 92, 157–180.Google Scholar
Lee, M.C., Aronson, J.L. & Savin, S.M. (1989) Timing and conditions of Permian Rotliegend Sandstone diagenesis, Southern North Sea: K/Ar and oxygen isotopic data. Am. Assoc. Petrol. Geol. Bull. 73, 195–215.Google Scholar
Liewig, N., Clauer, N. & Sommer, F. (1987) Rb-Sr and KAr dating of clay diagenesis in Jurassic sandstone reservoirs, North Sea. Am. Assoc. Petrol. Geol. Bull. 71, 1467–1474.Google Scholar
Mossmann, J.R. (1991) K-Ar dating of authigenic illitesmectite clay material: application to complex mixtures of mixed-layer assemblages. Clay Miner. 26, 189–198.Google Scholar
Mossmann, J.R., Clauer, N. & Liewig, N. (1992) Dating thermal anomalies in sedimentary basins: The diagenetic history of clay minerals in the triassic sandstones of the Paris Basin, France. Clay Miner. 27, 211–226.Google Scholar
Pevear, D.R. (1999) Illite and hydrocarbon exploration. Proc. Natl. Acad. Sci. USA, 96, 3440–3446 (PNAS is available online at www.pnas.org).Google Scholar
JrReynolds, R.C., (1985) NEWMOD© a computer program for the calculation of one-dimensional patterns of mixed-layer clays. Reynolds, R.C., 8 Brook Road, Hannover, NH 03755, USA.Google Scholar
Środoń, J. (1999) Extracting K-Ar ages from shales: a theoretical test. Clay Miner. 34, 375–378.CrossRefGoogle Scholar